OpenFOAM を用いたふく射・対流場の連成伝熱解析の妥当性評価

抄録

In recent years, natural ventilation has attracting attention as a ventilation method for buildings. In order to realize the method, it is important to understand natural convection of large-scale air in the building considering radiation influenced by the thermal radiation. This research aims to understand the combined heat transfer phenomenon of natural convection and radiation by using OpenFOAM, a CFD open software that has been attracting attention in recent years. Although the radiation library is attached to OpenFOAM, there are many unclear points regarding the analysis accuracy of this library. To evaluate the accuracy of the radiation library of OpenFOAM, a laminar natural convection under the influence of radiation was analyzed in this study. The dependence of the number of divisions on the spatial angle of radiation calculation was investigatd. Assuming that 10 degree of the division angle is correct, the accuracy dependency of the discretizing angle for ray for discrete ordinate method was investigated. Temperature and velocity distribution, and heat transfer coefficient were used as parameters for comparison. As a result, it was found that the error was less than 1 percent when divided into 18 degrees.